JPS6340079B2 - - Google Patents

Description

Detailed Description of the Invention In general, in a cyclic time division multiplex transmission system, it takes one terminal access time x the number of terminals to complete access to all terminals. There is a problem with slow responses when you want to immediately control, display, or contact someone.

The present invention has been provided in view of the above-mentioned points, and is provided with an interrupt reply function in a terminal device, and when there is an input, it notifies the parent device by interrupt, thereby changing the normal access cycle and changing the normal access cycle. The machine accesses the terminal device that received the interrupt, so that, for example, a terminal device used exclusively for monitoring functions by not accessing it normally but only when an interrupt signal is received. Normally, the control signal from the base unit is sent to each terminal in sequence, and the control display priority can be checked in response to an interrupt signal from any terminal, thereby increasing the response speed. The purpose of the present invention is to provide a time division multiplex transmission system that enables significant improvements.

An embodiment of the present invention will be described in detail below with reference to the drawings.
Figure 1 shows the system configuration of a basic time division multiplex transmission system to which the present invention is applied.
and a large number of terminal devices 2 are connected via signal lines 3, and each terminal device 2 has an address setting device 4.
are attached, and each has an independent address. In the figure, 5 is the monitoring input contact, and 6 is each terminal device 2.
It is a controlled load that is controlled by, for example, a lamp or the like. Figures 2a and 2b show signals on the signal line 3 during normal polling operation, and a in the figure is a transmission signal from the base unit 1 to each terminal unit 2.
This is a signal that is transmitted to the destination, and consists of a start signal, an address signal, a control signal, etc. Also, b in the figure is a monitoring signal, in which data on the monitoring status of the terminal device 2 is sent back to the main device as a monitoring signal from the terminal device 2 called up by the address signal in the transmission signal from the main device 1. become.

Thus, in the system shown in FIG. 1, by transmitting signals as shown in FIG. 2 between base unit 1 and terminal unit 2, base unit 1 polls each terminal unit 2 in turn. , remotely controls the controlled load 5 in the called terminal 2 and sends monitoring status data back to the base unit 1 as a monitoring signal, and as described above, all the terminals 2 are polled in sequence. The problem is that it takes a considerable amount of time and has poor responsiveness in emergencies. Therefore, in the present invention,
In addition to the normal transmission signal for control and monitoring shown in FIG. 2, a transmission signal as an interrupt permission signal is provided as the transmission signal sent from the base unit 1, and the transmission signal for control and monitoring is normally sent. transmits an interrupt permission signal at each appropriate timing, receives the interrupt permission signal at the terminal device 2 where the monitoring input signal has changed, and synchronizes with this to transmit the interrupt monitoring signal to the base device 1.
It was designed to be sent back to. Figure 3 a, b
shows an example of the interrupt permission signal and the interrupt monitoring signal. The interrupt monitoring signal is made up of the lower several bits of the address of the terminal device 2 that transmits it (the remaining few bits after removing the upper group address signal from the original address signal). In this way, when base unit 1 transmits an interrupt permission signal, terminal unit 2 receives it, first determines that this signal is an interrupt permission signal from the shortness of the address signal part of this received signal, and then If the upper bits of the own address are compared with the transmitted group address signal, and if they match, and there is an input to the monitoring input terminal of terminal 2, the lower bits of the own address are output as an interrupt monitoring signal. Data corresponding to bits will be transmitted to base unit 1. As a result, on the base unit 1 side, the upper address as the group address signal sent out,
By combining the address lower order data obtained from the terminal device 2 as the interrupt monitoring signal, the terminal device 2 that issued the interrupt monitoring signal is determined. In this way, the main device 1 side transmits the address of the interrupt monitoring signal generating terminal device 2 obtained in the previous section using the transmission signal shown in FIG. 2a, thereby collecting the monitoring input information input to the terminal device 2, Processing will be performed according to a predetermined sequence. After this, the terminal device 2 that sent out the monitoring input by interrupt becomes processed and does not issue an interrupt monitoring signal even if the monitoring input continues to be received.

To explain this in more detail, while performing control based on the information input to the base unit 1, if the address is 8 bits, the upper 4 bits are used as an interrupt enable signal. The terminal device 2 corresponding to 16 addresses in one group is simultaneously accessed by sending it as a group address signal, and if an interrupt monitoring signal is generated from any terminal device 2 in this group during this time, a lower address than this can be obtained. The terminal device 2 can be identified, and the identified address can be accessed using a normal mode transmission signal to control and monitor the terminal device 2. Here the lower address is
There are 16 addresses, and if monitoring input is input to multiple of these 16 terminals 2 at the same time and the interrupt monitoring signals overlap, the base unit 2 may not be able to identify the address (however, if the interrupt monitoring signal is issued) This can be determined on the base unit 2 side). In this case, by sequentially accessing the lower 4-bit 16 addresses using the normal transmission signal shown in Figure 2 and checking the supervisory signal input at that time, it is possible to know which terminal 2 has changed the supervisory input. It is possible to know the monitoring signal. The reason for creating the interrupt enable signal by dividing the address signal into upper and lower parts is that if the interrupt enable signal does not have any address elements, the entire interrupt monitoring signal is It is necessary to send address information from the terminal device 2.
This makes it possible to know the address of terminal 2 where a change in the monitoring input occurred, but if the interrupt monitoring signals overlap, the address cannot be identified, so unless all addresses are accessed, the monitoring input will not be detected. This means that the terminal device 2 cannot make a determination. Therefore, in the embodiment, an appropriate number of terminals 2 are grouped according to the addresses of the terminals 2, and an interrupt permission signal containing the group address signal of the group is sent to each group, thereby generating an interrupt monitoring signal. Even if they overlap, it becomes easy to identify the terminal device that generated the interrupt monitoring signal.

Figure 4 shows a flowchart of information processing within the base unit 1, in which each terminal unit 2 is accessed (polling) using a normal transmission signal in a loop, and from the first to the last in a loop (and ''). generation of an interrupt enable signal for the group address of
The control operation for monitoring the terminal device 2 when the terminal device 2 address is specified by the interrupt monitoring signal is performed in the loop. When two addresses cannot be specified, control operations for individual monitoring by successively accessing the terminals 2 in the group are performed. Fifth
The figure shows a flowchart of information processing within the terminal device 2, in which a loop checks whether there is a change in the monitoring input and sets an interrupt generation flag when the monitoring input changes. In other words, an unillustrated input mode changeover switch can be used to generate an interrupt when the monitoring input turns on or off (10), such as when monitoring equipment operation, or when the monitoring input is a push switch or the like and a person presses it to turn it off. When there is a change from 0 to 1 (from 0 to 1) as valid information input, when checking the monitoring input change, depending on the setting state of the input mode switch, Appropriate logical operations are performed between the previous data and new data, and
The interrupt generation flag is set only when the signal of the set mode changes, and the interrupt permission signal from the base unit 1 is waited for. Next, in the loop, processing operations when receiving a normal transmission signal are performed, and in the loop, processing operations when receiving an interrupt permission signal are performed.

Since the present invention is configured as described above, it can be applied to terminals for which the probability of receiving new monitoring inputs is very low in the conventional method, or for terminals to which monitoring inputs are frequently input. As the data needs to be accessed at the same rate, the access time required to go through the whole process becomes longer, slowing down the acquisition of frequently input information, or even rarely occurring inputs being urgently required. Responses to those that require information processing were becoming slow, but for example, the system frequently sends out interrupt permission signals except when there is a control signal from the base unit, and checks for terminals whose monitoring inputs have changed. This has the effect of probabilistically shortening the time from input of a monitoring input to completion of processing regardless of the number of connected terminals.

In addition, a large number of terminal devices are grouped according to the upper address, and the address signal of the interrupt permission signal is used as the upper address signal, and the interrupt monitoring signal is used as the lower address signal of the address set in each terminal device. Since the base unit identifies the terminal device address where the monitoring input change occurred based on the upper address sent by the base unit as an interrupt permission signal and the lower address obtained from the interrupt monitoring signal, the terminal The grouping (higher addresses) and intra-group addresses (lower addresses) can be easily set, and the address arithmetic processing for specifying the interrupt generating terminal device where the monitored input change has occurred can be easily performed. In addition, when interrupt monitoring signals are sent from multiple terminals at the same time and the signals overlap, all terminals in the group are checked individually by normal polling, so the terminals in the group Even when the number of access points is increased to shorten the access time for one round, the effect is that interrupt processing can be performed quickly without trouble, and a highly reliable time division multiplex transmission system can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the basic system that is the premise of the present invention, Fig. 2 is a time chart of the same signal transmission as above, and Fig. 3 is a time chart of the interrupt permission signal and interrupt monitoring signal of one embodiment of the present invention. , FIG. 4 is a flowchart of an example of information processing within the base unit same as above, and FIG. 5 is a flowchart of an example of information processing within the terminal unit same as above, where 1 is the base unit and 2 is the terminal unit.

Claims (1)

[Claims] 1. Access each terminal individually from the base unit, send and receive signals between the base unit and the called terminal, control and monitor the terminal side, and permit interruptions. A signal is sent from the base unit, and when the monitoring input signal to the terminal device changes, the terminal unit sends an interrupt monitoring signal to the base unit in synchronization with the above-mentioned interrupt permission signal, and the monitoring input signal of this terminal device is In a time division multiplex transmission system that notifies the base unit that a change has occurred in
A large number of terminal devices are grouped according to the upper address set in each terminal device, and the address signal of the interrupt permission signal is used as the upper address signal, and the interrupt monitoring signal is set to the address set in each terminal device. The lower address signal is used as the lower address signal, and the base unit identifies the terminal address where the monitoring input change occurred based on the upper address sent as the interrupt permission signal on the base unit side and the lower address obtained from the interrupt monitoring signal. , a time-sharing system characterized in that, if interrupt monitoring signals are sent from multiple terminals at the same time and the signals overlap, all terminals in the group are checked individually by normal polling. Multiplex transmission method. 2. Has an interrupt generation flag in the terminal, sets this flag when a change occurs in the monitoring input, and sends an interrupt monitoring signal when the corresponding interrupt permission signal is received when this flag is set. The main unit is notified of the change in the monitoring input and the terminal device address, and the main unit monitors the terminal device based on this address, receives the monitoring input signal, and at this time, the flag is cleared. A time division multiplex transmission system according to claim 1. 3 It has an input switching circuit that can set the monitored input change to three types of modes: when the input changes to either positive or negative, when it changes from positive to negative, and when it changes from negative to positive. The time division multiplex transmission system according to claim 2, characterized in that a switching input of an input switching circuit is used to set which of the three modes the interrupt generation flag is to be set at. .